Which body system produces proteins that fight infections?

Answer and Explanation:

The Immune System. It comprises the white blood cells, lymphatic system, etc. The immune response is the production of antibodies in response to antigens present in pathogens and other foreign matter.

The leukocytes are formed in the bone marrow of long bones and lymph nodes. Their function is to protect the body from invasion of foreign material like bacteria and viruses( pathogens). They help fight against infections by engulfing and digesting pathogens and production of antibodies which are proteins that bind to pathogens. Their number increases greatly during infections.

Answer and Explanation:

Gene mutation involves a change in the structure of a gene. a gene mutation arises as a result of a change in the chemical nature of the gene.Gene mutation include deletion and inversion.

Deletion is the removal of a gene portion. if the base thymine is deleted from its position at the section of the DNA, the base sequence becomes altered at this point.

Inversion occurs when a portion of a DNA strand breaks at two points, the middle piece detaches and rotates 180 and then rejoins with the base sequences inverted.